Seems that Google Penguin 3.0 algorithm is hunting for websites that have used black hat SEO to generate or obtain backlinks but I know for sure a few websites doing that and yet they didn't get penalized. What do you thing is the best way to prevent that?

Penguin is targeting websites that don't have enough backlinks or they have tons of low PR and quality ones. So the best solution would be to simply manually generate backlinks and make sure they are coming from high PR, authority relevant site.

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